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1>create an empty flash device (By default this uses the ram memory
but we can allocate other by the cache_file option)
2>mount ubi on it
3>mount ubifs on it
=> (Here we can load the previously stored image)
4>use it
5>while unmounting save the image on permanant storage

So as we can see, though NANDSIM can be effectively used for
simulating flash , it is of limited use in our project for testing
mount time as every time only the empty device is mounted.